3 packet direction examples – ZyXEL Communications 5 Series User Manual
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ZyWALL 5/35/70 Series User’s Guide
Chapter 11 Firewall
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To set the ZyWALL to by default silently block traffic from WAN 1 from going to the DMZ
interfaces, you would find where the From WAN1 row and the To DMZ column intersect and
set the field to Drop as shown.
Figure 105 Default Block Traffic From WAN1 to DMZ Example
11.3 Packet Direction Examples
Firewall rules are grouped based on the direction of travel of packets to which they apply. This
section gives some examples of why you might configure firewall rules for specific
connection directions.
By default, the ZyWALL allows packets traveling in the following directions.:
• LAN to LAN These rules specify which computers on the LAN can manage the
ZyWALL (remote management) and communicate between networks or
subnets connected to the LAN interface (IP alias).
Note: You can also configure the remote management settings to
allow only a specific computer to manage the ZyWALL.
• LAN to WAN
1
These rules specify which computers on the LAN can access which
computers or services connected to WAN 1. See
for an example.